[DO NOT WORRY, HE WAITS. he isn't even offended by her doubt, because yeah, he knows how the Phantom Thieves saw him prior to him joining the group. he knows how they still see him, probably. especially if they ever learn what happened between him and Kurusu]

Morgana-- Mona, right?-- is the talking cat that is always with Joker. He took me by surprise the first time I heard him talk, actually!

[that surprise is reflected in his voice]